Our Rheem heat-pump is on the fritz. It keeps triggering the high-pressure cut-off on the outdoor unit. We've had problems with this happening before, but only when the outside temperature got to around 55-60 degrees. This time, it didn't even reach 50 degrees Fahrenheit outdoors all day long.
So now our heater is running constantly rather than shutting off occasionally like it normally does. It's blowing lukewarm air instead of hot air. I tried resetting the system outside. It runs for a while, but the high-pressure warning goes off after about an hour. Is this problem solvable on my own, or do I need to call in a repair man to have a look?